Before you argue for crazy upsampling rates on red book cds...
I have my transport set at upsamling OFF.
I have noted that all forced upsampling just make it sounds unnatural.
I have my transport decoupled (floating) /discs of silenece on solid oak platform. Under transport i use black diamong racing mk4 pucks and cones. My dac is on a more solid base. Entreq feets, solid oak platform, on that i have SSC (string suspension concept) platform and transport on black diamond racing mk3 pucks and cones.
If i for instance change discs of silence to SSC feets, it sounds way way different. If you should deem cables, transports and very much upsampling, i hope you got your machines on something that rid them of external vibrations and more current.